package com.funtl.screw.admin.config;

import cn.hutool.json.JSONArray;
import cn.hutool.json.JSONUtil;
import com.funtl.screw.admin.service.SysRouteConfService;
import com.funtl.screw.common.core.constant.CacheConstants;
import com.funtl.screw.common.gateway.support.DynamicRouteInitEvent;
import com.funtl.screw.common.gateway.vo.RouteDefinitionVo;
import lombok.AllArgsConstructor;
import lombok.extern.slf4j.Slf4j;
import org.springframework.boot.web.context.WebServerInitializedEvent;
import org.springframework.cloud.gateway.filter.FilterDefinition;
import org.springframework.cloud.gateway.handler.predicate.PredicateDefinition;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import org.springframework.context.event.EventListener;
import org.springframework.core.annotation.Order;
import org.springframework.data.redis.connection.RedisConnectionFactory;
import org.springframework.data.redis.core.RedisTemplate;
import org.springframework.data.redis.listener.ChannelTopic;
import org.springframework.data.redis.listener.RedisMessageListenerContainer;
import org.springframework.data.redis.serializer.Jackson2JsonRedisSerializer;
import org.springframework.scheduling.annotation.Async;

import java.net.URI;
import java.util.Map;

/**
 * 容器启动后保存配置文件里面的路由信息到Redis
 *
 * @author lusifer
 */
@Slf4j
@Configuration
@AllArgsConstructor
public class DynamicRouteInit {

    private final RedisTemplate redisTemplate;

    private final SysRouteConfService routeConfService;

    @Async
    @Order
    @EventListener({WebServerInitializedEvent.class, DynamicRouteInitEvent.class})
    public void initRoute() {
        redisTemplate.delete(CacheConstants.ROUTE_KEY);
        log.info("开始初始化网关路由");
        routeConfService.list().forEach(route -> {
            RouteDefinitionVo vo = new RouteDefinitionVo();
            vo.setRouteName(route.getRouteName());
            vo.setId(route.getRouteId());
            vo.setUri(URI.create(route.getUri()));
            vo.setOrder(route.getSortOrder());
            JSONArray filterObj = JSONUtil.parseArray(route.getFilters());
            vo.setFilters(filterObj.toList(FilterDefinition.class));
            JSONArray predicateObj = JSONUtil.parseArray(route.getPredicates());
            vo.setPredicates(predicateObj.toList(PredicateDefinition.class));
            vo.setMetadata(JSONUtil.toBean(route.getMetadata(), Map.class));
            log.info("加载路由ID：{},{}", route.getRouteId(), vo);
            redisTemplate.setHashValueSerializer(new Jackson2JsonRedisSerializer<>(RouteDefinitionVo.class));
            redisTemplate.opsForHash().put(CacheConstants.ROUTE_KEY, route.getRouteId(), vo);
        });
        // 通知网关重置路由
        redisTemplate.convertAndSend(CacheConstants.ROUTE_JVM_RELOAD_TOPIC, "路由信息,网关缓存更新");
        log.debug("初始化网关路由结束 ");
    }

    /**
     * redis 监听配置,监听 gateway_redis_route_reload_topic,重新加载Redis
     */
    @Bean
    public RedisMessageListenerContainer redisContainer(RedisConnectionFactory redisConnectionFactory) {
        RedisMessageListenerContainer container = new RedisMessageListenerContainer();
        container.setConnectionFactory(redisConnectionFactory);
        container.addMessageListener((message, bytes) -> {
            log.warn("接收到重新Redis 重新加载路由事件");
            initRoute();
        }, new ChannelTopic(CacheConstants.ROUTE_REDIS_RELOAD_TOPIC));
        return container;
    }
}
